Low Light Field Report: R6 Mark II at the aquarium

Okay - so I've had my R6 Mark II for a couple of weeks now, and I'm starting to formulate a number of thoughts.  To give you a bit of background, last camera that I owned was a Nikon D850, but switched to Canon as between the D850 and the R6 Mark II purchases, I added a Canon C70 to my suite, and it didn't make sense to own two systems - so I'm in the process of switching over completely to Canon RF.
The following images, I have purposely placed zero noise reduction so that you can see things warts n all.
I went to the aquarium, and took along my son for the very first time.

So, from what I can understand from Bill Claff's charts, a third DR spike occurs at ISO 400.  I can confirm that the DR from the RAWs at around ISO 400 are extremely malleable.  To give you an idea, here's two of the same shot, edited to taste, just to see how drastic you can make as far as changes are concerned without there being a penalty in image quality.  In the image, the whole area was tinted blue due to the tank.  Moving forward, I think I will solely use a mechanical shutter or efcs as the data from Bill Claff seems to suggest there is significant DR loss when shooting only with electronic shutter (like almost up to 2 stops!)  It's only once you get to ISO 1600 and over where there's no difference.

This is the original

Edit to taste

Eye AF is a wonderful thing, and Canon's implementation of it is particularly nice to use.  In the shot below, it honed in on his right (our left) eye.

Eye AF seems accurate and intuitive to use.

At lower light, the EyeAF works just fine too.  Also, ISO 5000 provides extremely useable results.

I solely used the RF 50mm 1.8, Great little lightweight walkabout lens, however, I definitely feel that other lenses perform better with the Eye AF and Servo selected.
Noise-wise, I generally think of anything up to 1600 as essentially noise-free.

For anyone that's interested - the CLOG3 from the C70 and the R6 produce very different results.  So different that matching them would be harder than I thought it'd be.  The C70 due to its DGO sensor produces significantly cleaner results, whereas the R6 Mark II, you need to be extremely careful to ensure that you're getting enough information into the shadows - expose for the shadows, and crush it down in post because pulling in post from the R6 Mark II is extremely noisy compared to the C70.  Maybe I'll make a separate post in the future.
All in all, I'm liking what I'm seeing so far in regards to file malleability from the R6 Mark II, and as a walkabout, it's small and light in the right configuration and definitely something that I don't have any qualms in taking around with me.  I'm still not completely used to the control wheels just yet, but I just need some more time to build that muscle memory.  Other than that, I can definitely recommend the aquarium as a wonderful place to take a little one - the bright colours and all the movement are very eye catching for the little ones!